Offset-web cleaner for printing-presses.



J. M. TRIER.

OFfSET WEB CLEANER FOR PRINTING PRESSES. APPLICATION FILED FEB. I, 1911.

1,287,524. Patented Dec. 10, 1918.

Z SHEETSSHEET I.

WITNESSES mum/ 01? c/amas' M 77%? ATTORNEYS J. M. THIER.

OFFSET WEB CLEANER FOR PRINTING PRESSES/ APPLICATION FILED His. 1. um.

13873524., Patented Dec.10, 1918.

2 SHEETSSHEET 2- WITNESSES W INVENTOR fiflW/p i5 3 Mamas/147M? aATTORNEYS m: mamas Pzrsns cu. Pnayn-urna. WASMIHGTDN. a r.

JAMES M. warns, on NEW YORK, n. Y.

OFFSETFWEB CLEANER. FOR PRINTING-PRESSES.

Specification of Letters Patent.

Patented Dec. 10, 1918.

Application filed February 7, 1917. Serial No. 147,054.

To all whom it may concern Be it known that 1, JAMES M. TRLER, a citizenof the United States, and a resident of the city of New York, borough ofthe Bronx, in the county of Bronx and State of New York, have invented anew and Improved Ofi'set-VVeb Cleaner for Printing-Presses, of which thefollowing is a full, clear and exact description.

Among the principal objects which the present invention has in view are:to extend the useful life of an offset web; to prevent the accumulationof smutting or blurring substances on said web; to smooth said Webbefore introducing the same to the packing roller; to provide apparatusfor the accomplishment of the above-stated purposes which areinterchangeable and quickly adjustable; and to concentrate theaccumulated debris collected from said web.

Drawings.

Figure 1 is a longitudinal vertical section showing diagrammatically,the arrangement of printing, packing and Web-winding cylinders and guiderollers connected therewith as embodied in presses of conventional make,together with a cleaner for said web constructed and arranged inaccordance with the present invention;

Fig. 2 is a plan view of said cleaner;

Fig. 3 is a cross section of the cleaner on an enlarged scale, thesection being taken as on the line 33 in Fig. 2;

Fig. 4 is a longitudinal section on an enlarged scale, showing afragment of said cleaner and pivot therefor, the section being taken ason the line 44 in Fig. 2;

Fig. 5 is a detail view on an enlarged scale, and in longitudinalsection,the section being taken as on the line 55 in Fig. 2;

Fig. 6 is a cross section of the same, the

section being taken as on the line 66 in Fig. 2.

Description.

The usual practice in most of the improved presses is to print bothsides of the web in a singlepassage through the press.

To accomplish this the web 11 indicated in 12 is, of course, the sideturned away from the said roller. I

To prevent the transfer of the wet ink of the previously printingoperation to the packing roller 13, an offset web 14 is used... This webcovers the surface of the packing roller 13 with which the web 12 is incontact. The web 14 therefore backs or liesin close contact with the web11, and by moving synchronously therewith, all danger of smudging thewet ink-on that side of the web 11 isavoided. It is obvious that whilein contact with the wet sheet or'web 11, a portion of the wet ink istransferred to the offset web 14.

The offset web 14 is wound on the drum 15, which is supported on thesynchronized driving rollers 16 to be rotated thereby at a pcripheralspeed equal to .the travel of the web 11. In this manner is avoided anytendency to pull the offset web 14 in advance of the web 11.

It is obvious that the ink deposit on the offset web 14 is held betweenthe convolutions thereof when the same is rolled on the drum 15. When inaccordance with the usual custom the drums 15 and 17 are reversed andthe web 14 is fed in the reverse direction from that indicatedin Fig. 1of webis transferred to the web 11 when passing between the rollers 12and .13. To overcome this objection is the principal object of thepresent invention, and to this end is employed the cleaner shown best inFig. 2 of the drawings.

The said cleaner has a stationary hanger frame 18. The frame 18 isprovided at the opposite ends thereof with hanging straps 19, each ofwhich is furnished with a vertical slot 20, through which bolts forsuspending the frame 18 are passed to be secured in the frame of theprinting press to which the cleaner is attached. The length of the slots20 is suffieient to permit vertical adjustment of the ends of the frame18 to lift the rubbing bars above the plane coincident with the loweredges of the guide rolls 21 of the printing press as shown in Fig. 1 ofthe drawings.

The frame 18 has at the longitudinal center thereof, alinedoppositely-disposed saddles 22. The saddles 22 are semi-circular, thecenter of the curve being coincident with the tops of the rubbing blades23 whereon rests the under surface of the offset web 1 1. In other wordsthe centers or curved surfaces of the saddles 22 are in service, in theplane with the offset web 14. In this manner, provision is made to avoidshifting the said offset web 1 1 when the blades 23 are rocked.

Each of the blades 23 is bent at its center to form a sharp angle. Theside extensions of said blades from said angles operate to smooth orspread each side of the web 14 thesame is drawn over the said blades.

The blades 23 are mounted on an elongated rectangular frame having sidebars 21 and a series of cross bars Centrally disposed and attached tothe side bars 2 1 are curved pivot rockers 26. The curva ture of therockers 26 as shown best in Fig. 1 of the drawings, corresponds with thecurved seats of the saddles 22. For this reason when the frame carryingth blades 23 is locked on its center, the movement is coincident withthe plane of the web 141 resting on said blades. The pins 27 areinserted through the sides of the frame 18 and in service extend abovethe rockers 26 to prevent lifting said rockers from thesaddles 22.

The rocking frame above described is provided with rubbing blades 28 and29, said blades being bent to a more obtuse angle than the blades 23.The inclination of the lateral sections of said blades is in a similardirection to that of the lateral sections of the blades 23. The rockingframe is normally held level by. springs 30. The springs 30 are guidedby the pins 31, which, as shown best in Fig. 3 of the drawings are madefast to the end cross bars of the stationary frame 18.

By placing the frame 18 so that the web 1% is elevated slightly abovethe lower level of the guide rolls 21, a gentle tension is eX- erted onthe web 1% by the blades 23, 28 and 29.' The pressure of the web 14: onthe said blades provides a frictional contact of the web so that thesame is brought within the influence of the angularly-disposed sectionsof the blades, which tends to lead the web in the direction of theinclination. Both sections being inclined from the center of the web theresult is that the web is slightly drawn or spread from its center.

hen a printing press employing an offset web such as indicated by thenumeral 14-, is equippedwith cleaner constructed and arranged inaccordance with the present invention, the caked or surface-adhering inkor other deposit is removed from the surface of said web before the samebrought into contact with the web 11. The blades 23 2S and 29 operate tobreak the deposit from the surface of the web 14L rather than to scrapethe same. This is due to the adhesion of the deposit accumulated at theedge of each of said blades.

It is obvious that the web 1% is liable to become stretched orcontracted in sections adjacent either of the lateral edges thereof. Theslackness or tightness of the web resulting from this is accommodated bythe rock of the frame and the blades '23, 28 and 29 mounted thereon.

It is obvious that by moving a cleaner such as described, the servicelife of an offset web is augmented and smudging or defacing the webbeing printed is avoided.

Claims.

1. The combination of a printing press and an offset web therefor; acleaner for said web embodying rigid rubbing members disposed transversesaid web in supporting relation thereto; means for keeping said web incontact with said rubbin members; and means for pivoting said membersfor rocking in correspondence with the pressure on said web, said meansembodying a pivot, the axis whereof is in a plane coincident with saidweb.

2. The coi'nbination of a printing press and an offset .web therefor; acleaner for said web embodying rigid rubbing members disposed transversesaid web in supporting relation thereto; means for keeping said web incontact with said rubbing members; and

means for pivoting said members for rock.

ing in correspondence with the pressure on said web, said meansembodying a pivot, the axis whereof approximates the plane of said web.

The combination of a printing press and an offset web therefor; acleaner for said web embodying rigid rubbing members disposed transversesaid web in'supporting' re lation thereto; means for keeping said web incontact with said rubbing members; and means for pivoting said membersfor rocking in correspondence with the pressure on said web, said meansembodying a pivot, the axis whereof is in a plane coincident with findadjacent the upper edge of said meniers.

JAMES M. TRIER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. 0.

